Recent questions in Analytical Chemistry

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What is the purity of a sample of acetanilide if its melting point range is observed to be 114.5-116°C and the literature value for pure acetanilide is 114-115°C?

asked Feb 20 in Analytical Chemistry by SilviaKetcha (1.6k points)

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What specific compounds are present in a sample of an unknown substance using Raman spectroscopy and how can we identify and quantify them?

asked Feb 14 in Analytical Chemistry by LeoQuinonez1 (1.9k points)

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What is the percentage composition of copper (Cu), iron (Fe), and sulfur (S) in a sample of pyrite? Use elemental analysis to determine the amount of each element present in the sample and calculate the percentage composition by mass.

asked Feb 13 in Analytical Chemistry by SommerBartos (1.8k points)

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What is the purity of a sample of aspirin if its observed melting point range is 136.5-138.5°C, given the literature melting point of pure aspirin is 138-140°C?

asked Feb 13 in Analytical Chemistry by CharleneCove (1.6k points)

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What is the concentration of potassium ions in a 0.1 M solution of potassium chloride using a potassium ion-selective electrode?

asked Feb 13 in Analytical Chemistry by JulianKnetes (2.0k points)

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What is the percentage purity of a given sample of aspirin when the melting point is determined to be 135°C? The literature melting point range for pure aspirin is 135-136°C.

asked Feb 12 in Analytical Chemistry by ElkeMary0923 (1.7k points)

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What is the purity of a sample of acetanilide that has a melting point range of 112-114°C when the literature melting point range for pure acetanilide is 114-115°C?

asked Feb 12 in Analytical Chemistry by RaleighAckle (1.8k points)

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1 answer 66 views

What is the coulometric titration method for quantifying the amount of copper in a brass sample? Provide a detailed procedure for carrying out the coulometric titration method to determine the amount of copper in the sample.

asked Feb 12 in Analytical Chemistry by ZKLBarbra368 (2.3k points)

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1 answer 105 views

What is the percentage of nitrogen, carbon, and hydrogen in a sample of caffeine obtained from coffee beans? Use elemental analysis to determine the composition of the sample.

asked Jan 31 in Analytical Chemistry by ElyseY075419 (1.7k points)

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1 answer 87 views

What is the percentage composition of carbon, hydrogen, and nitrogen in a sample of caffeine, using elemental analysis?

asked Jan 31 in Analytical Chemistry by Wilbur29087 (1.8k points)

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1 answer 101 views

What is the percentage composition of carbon, hydrogen, and nitrogen in a sample of caffeine? Use elemental analysis to determine the answer.

asked Jan 31 in Analytical Chemistry by DanaPittmann (1.5k points)

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What is the percent composition of carbon, hydrogen, and nitrogen in a sample of caffeine? Use elemental analysis to determine the answer.

asked Jan 31 in Analytical Chemistry by IsabelleTitu (1.8k points)

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What is the percent composition of carbon, hydrogen, and nitrogen in a 10 gram sample of caffeine? Use elemental analysis to determine the answer.

asked Jan 31 in Analytical Chemistry by LawrenceShel (1.6k points)

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1 answer 106 views

What is the structure of the unknown compound X, based on its nuclear magnetic resonance spectrum, which shows a singlet at δ 7.8 ppm and a triplet at δ 1.2 ppm?

asked Jan 31 in Analytical Chemistry by LavonneFuqua (1.4k points)

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1 answer 131 views

What is the structure of compound X, based on its nuclear magnetic resonance spectroscopy spectrum, which displays a singlet at 3.8 ppm and a quartet at 1.2 ppm?

asked Jan 31 in Analytical Chemistry by LeathaOchoa (1.7k points)

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1 answer 79 views

What is the structure of compound X based on its proton NMR spectrum, which shows a singlet at 1.2 ppm with an integration of 3, a doublet at 2.5 ppm with an integration of 2, and a quartet at 3.7 ppm with an integration of 1?

asked Jan 31 in Analytical Chemistry by EusebiaGilla (1.8k points)

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1 answer 83 views

What is the structure of an unknown compound with molecular formula C5H10O2 that exhibits singlets in its 1H-NMR spectrum at δ 1.1, 2.3 and 3.7 ppm and a doublet at δ 2.9 ppm?

asked Jan 31 in Analytical Chemistry by Lula12H24597 (2.6k points)

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1 answer 36 views

What is the concentration of lead in a water sample collected from a nearby river? analyze the sample using Atomic Absorption Spectroscopy and report the result in ppm.

asked Jan 31 in Analytical Chemistry by DoraSturm903 (1.8k points)

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1 answer 94 views

What is the concentration of lead ions in a water sample collected from a contaminated site? Use atomic absorption spectroscopy to quantify the lead ions in the sample and report your results in ppm.

asked Jan 31 in Analytical Chemistry by CathrynMacMa (2.5k points)

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1 answer 100 views

What is the unidentified compound present in a given sample, and what is its molecular weight, using mass spectrometry?

asked Jan 31 in Analytical Chemistry by RachelMcCann (2.2k points)

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